Issue

Sometime it can happen when you try to open an excel file, you receive a message telling that the excel file is locked by somebody and you can access it only in read only mode, even if the other user is not using it.

Resolution

Connect on the server that has the File Server role.

Open Computer Management

In the console tree, expand System Tools/Shared Folders/Open Files.

Search the file locked in the list, click right on it and select Close Open File